Making of rubber coloring material



a Patented Apr. 1 l, 1933' p V MAKING or RUBBER commandment iNo Drawing.Application filed March 26, l93 ll s erial N'o This invention relatesftothe making of beprecipitated ofcolloidal disper- V rubber coloringmaterial. sion, each particle being surrounded by a pro- 1 One importantobject of the invention is .tective coating of rubber which/thus 'pre- 1to provide-a novel process of manufacturing vents agglomeration andconsequentinequal-- 5 rubber coloring material wherein the pigity oftone. This compositionissheeted and ment Will be in colloidal dispersionthroughdried on an ordinary rubber sheeting millout the material so thatit may be blended and is then ready for-use in the manufacture"uniformly with the rubber which it is desired of rubber goods,being'mixed Withthe rubber to color. from which such goodsare to bemanufac- A second important'object. of the inventured in sufficientquantity to' produce the 1 tion is to provide a novel process forproducrequired shade. V p I v ing rubber coloring material wherein all Asecond manner of carrying the process forms of pigments, both organicand inorinto execution is as follows :Onepart of ganic may be used.rubber color, either dry or inapulp form 7 A third important object ofthe invention (figured on a dry basis) is mixed thoroughly 5?, V is toprovide a novel process for manufactur- With Water to form a ligh ry,;&tr f ing rubber coloring material whereby a col Casein or otherprotective colloid being added oring material is produced directly inthe 'in the case of pigments which tend to agglomrubber which issuitable for use in the manur h Slurry n, mi With 11 facture of allkinds of rubber goods in which part oflatex, disperse d rubber or otheraque- 1.

artificial coloring is desirable; ous solution of rubber (figured on adryba- A fourth important object of the inven-f sis) The mixture is"then. agitated and" tion is to provide a novel process for proground toimpalpable finenessin any suitducing rubber coloring material especiallyable form of Wet grinder and isidried. Finaladapted for use in coloringsuch goods as-ly-the'dri d m heetedonfi r r e 6 5 raincoats, bathingcaps, shoes, insulation for ing mill and ready for as in theprep I Iwire, sheeting, inner tubes, tires and the like. none case. V a 1 Afifth important object of the invention .Asused in the claims heretoappended the is to produce a novel coloring matter. term rubber isintended to cover all sub- As one process for preparing suchcolorstances such aslatex, crepe rubber, sheet rub- ;.3 i

I '40 acid, 7

' ing material a rubber color intermediate, ber, milled rubber-and thelikewhichflare such as Victoria blue base for instance, is derived fromtherubber treeand plants off intimatelymixed with an equal quantity oflike general characteix V i i rubber in any suitablelmanner such as in aThere has thus been provided a highly eifi- 85. mill, a Banbury mixer,rubber cement churn cient rubber coloring composition and a +3.? V orthe like. Next. there is taken a color in novel process forproducing'the same. i termediate complementary to'the color inter- Itis'obvious that changes may be made in mediate above mentionedwhichcomplemen the form and construction" of the invention tary colorintermediate is phospho-tungstic Withoutdeparting from th'eprinciplesthereof.v It is not, therefore, desired to confine'the *5. O P O -12WO-42H O invention to the exact form herein shown and V described .but itis desired toinclude all such in the case of Victoria blue or one toform' ascome Withinthe scopeclaim'ed: a

a salt or'ester acid producing an insoluble I'claim:'

45 toner by intermediate condensation. .This is v 1. That 'process ofproducing ai coloring i then intimately mixed with an equal quancompoundfor rubber manufactures which, tity of rubber by any suitable means asindiconsists in mixing a color inter-mediate with I cated above. The twobatches thus pre rubber in equal parts until the color interme pared arenow mixed intimately together and Idiate isina'state ofcolloidal'dispersion, mix-' v this mixing causes the resultant pigmentto ing a color intermediate complementary to 11m;

- the "first with an equal quantity of rubber until the complementarycolor intermediate is in a state of colloidal dispersion, mixing the twobatches thus prepared together and drying and sheeting the finalmixture. 2. That process'of producing a coloring compound for rubbermanufactures which consists in mixing'a'color intermediate intilnatelywith an equal quantity of rubber, mixing a color intermediatecomplementary to the first With an equal quantity ofrubber,

mixing the tWo, batches thus prepared to-. gether drying and sheetingthe final mixture.

In testimony whereof I aflix mygsignature. 1.

THEODORE G, SULLIVAN.

